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Finding the Fourth Proportional to 920.19, 1,269.86 and 506.19

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Solution

The fourth proportional to 920.19, 1,269.86 and 506.19 is: 698.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.19 : 1,269.86 = 506.19 : x
  2. Step 2: Convert to fraction form
    920.19/1,269.86 = 506.19/x
  3. Step 3: Cross multiply
    920.19x = 1,269.86 × 506.19
  4. Step 4: Simplify right side
    920.19x = 642,790.43
  5. Step 5: Solve for x
    x = 642,790.43/920.19
  6. Step 6: Final answer
    x = 698.54

Related Problems

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.